It's a very bad fake. Coach never make that kind of lining for ANY bag, especially not a style 10124 which is one of the most-frequently faked styles from the mid 2000 decade. Any bag with that striped lining is fake. Did you happen to notice that the paired Cs in the pattern were at a 90-degree angle from how they're supposed to be, and that the entire C pattern itself is wrong? And that's just one problem from one photo.
Because styles 10124, 10125 and 10126 were so frequently faked, no one should EVER buy any bags with those style numbers without having a qualified authenticator check it first, especially from unregulated or unprotected sites like Facebook, which has become a dumping ground for all kinds of illegal and counterfeit items.
Get your money back if you can. Selling fakes is against US Federal law. The seller owes you a refund and any other merchadise she's selling might also be fake - the seller can't be trusted. If you try and sell it yourself you'd also be breaking the law, and donating it would just be passing on an illegal item to someone else. When found, fakes should be destroyed.